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這個可以明確PB5你可進行TIM3的引腳重映射。重映射后的操作參考如下：
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimBaseStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3 ,ENABLE ); //重映射相應的外設
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB, &GPIO_InitStructure);
TIM_TimeBaseStructInit(&TIM_TimBaseStructure);
TIM_TimBaseStructure.TIM_Prescaler = 0x0;
TIM_TimBaseStructure.TIM_Period = 2400;
TIM_TimBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3,&TIM_TimBaseStructure);
TIM_EncoderInterfaceConfig(TIM3,TIM_EncoderMode_TI12,TIM_ICPolarity_Rising,TIM_ICPolarity_Rising);
TIM_ICStructInit(&TIM_ICInitStructure);
TIM_ICInitStructure.TIM_ICFilter = 0;
TIM_ICInit(TIM3,&TIM_ICInitStructure);
TIM_ClearFlag(TIM3,TIM_FLAG_Update);
TIM_SetCounter(TIM3,0);
TIM_Cmd(TIM3,ENABLE);
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